Chemical Engineering MCQs

Page No. 619

Which of the following achieves the least reduction ratio for a given feed size ?


aJaw crusher


bRoll crusher


cCone crusher


dGyratory crusher


View Answer Roll crusher

Size measurement of ultrafine particles can be best expressed in terms of___________________?


aCentimetre


bScreen size


cMicron


dSurface area per unit mass



Rittinger number which designates the new surface produced per unit of mechanical energy absorbed by the material being crushed, depends on the ______________________?


aState or manner of application of the crushing force


bUltimate strength of the material


cElastic constant of the material


dAll A., B. and C.


View Answer All A., B. and C.

During filtration operation, the filtrate encounters the resistance of the ___________________?


aFilter medium


bCake


cChannel carrying the slurry to the upstream side of the cake and filtrate away from the filter medium


dAll A., B. and C.


View Answer All A., B. and C.

_____________ is the most suitable for compounding rubber and plastic solids ?


aBanbury mixer


bPan mixer


cPug mill


dCharge can mixer


View Answer Banbury mixer

What is the reduction ratio in a fine crushing operation having following feed and product sizes ?


a0.5


b2


c5


d10


View Answer 2

For a sphere falling in the constant drag co-efficient regime, its terminal velocity depends on its diameter D. as_________________?


ad


b√d


cd2


d1/d


View Answer d2

For efficient grinding, ball mills must be operated__________________?


aAt a speed less than the critical speed


bAt a speed more than the critical speed


cAt a speed equal to the critical speed


dWith minimum possible small balls



Rittinger’s number designates the new surface created per unit mechanical energy absorbed by the material being crushed. Larger value of Rittinger’s number of a material indicates its________________?


aEasier grindability


bPoor grindability


cHigh power consumption in grinding


dNone of these


View Answer Easier grindability

Carbon black is pulverised in a_______________?


aHammer crusher


bBall mill


cRoll crusher


dGyratory crusher


View Answer Ball mill

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